Aluminum is the most widely used and most versatile metal material in non-ferrous metals, and its application range is constantly expanding. There are many kinds of aluminum products produced by aluminum materials. Statistics show that there are different needs from the building decoration industry to the transportation industry, aerospace and other industries.

The advantages and characteristics of aluminum are as follows:

1. Low density. Aluminum density is about 2.7g/cm3. Its density is only 1/3 that of iron or copper.

2. High plasticity. Aluminum has good ductility and can be made into various articles by extrusion, stretching and other pressure processing processes.

3. Corrosion resistance. Aluminium is a metal with strong negative electricity capacity, which produces a protective oxide film on the surface under natural conditions or anodization, which has better corrosion resistance than steel.

4, easy to strengthen. Although the strength of pure aluminum is not high, the strength is improved after anodizing.

5. Easy surface treatment. Surface treatments can further improve or alter the surface properties of aluminum. The aluminum anodizing process is relatively mature and stable in operation, and has been widely used in the processing of aluminum products.

6. Good conductivity and easy to recycle.

Processing technology of aluminum products

Punching of aluminum products

1. Cold punch

Use material aluminum pellets. The extrusion machine and mold are used for one-time molding, which is suitable for cylindrical products or product shapes that are difficult to complete in the stretching process, such as oval, square, rectangle, etc.

The tonnage of the table used is related to the cross-sectional area of ​​the product. The gap between the upper and lower die punches and the lower die tungsten steel is the wall thickness of the product. The vertical clearance of the point is the top thickness of the product.

Advantages: The mold opening cycle is relatively short, and the development cost is relatively low.

Disadvantages: The production process is long, the product size changes greatly in the process, and the labor cost is high.

2. Stretching

Use material aluminum skin. The continuous molding table and mold are used to make it meet the shape requirements, and it is suitable for non-cylindrical bodies (aluminum products with curved products).

Advantages: During the production process, the complex and multi-shaped products have stable dimensional control, and the product surface is smooth and clean.

Disadvantages: high mold cost, long development cycle, and high requirements for machine selection and precision.

Surface treatment of aluminum products

1. Sandblasting (shot peening)

The process of cleaning and roughening metal surfaces using the impact of high-velocity sand streams.

Aluminum surface treatment can obtain a certain degree of cleanliness and different roughness on the surface of the workpiece, improve the mechanical properties of the workpiece surface, improve the fatigue resistance of the workpiece, increase the adhesion to the coating, prolong the durability of the coating, and is conducive to coating. Leveling and decoration of layers. This process we often see in various products of Apple.

2. Polishing

The mechanical, chemical or electrochemical action can be used to reduce the surface roughness of the workpiece and obtain a smooth and flat processing method. Grinding process is divided into: mechanical polishing, chemical polishing, electrolytic polishing. The aluminum material can be close to the mirror effect of stainless steel after mechanical polishing + electrolytic polishing. This process gives people a sense of high-end simplicity and fashionable future.

3. Drawing

Metal wire drawing is a manufacturing process in which the aluminum plate is repeatedly scraped out of the line with sandpaper. Drawing can be divided into straight drawing, random drawing, spiral drawing, thread drawing. The metal wire drawing process can clearly reveal every filament, so that the metal matte shines with a filament luster, and the product has a sense of fashion and technology.

4. High gloss cutting

Use the engraving machine to reinforce the diamond knife on the high-speed rotating spindle of the engraving machine to cut the parts, so that the product surface produces a local highlight area. The speed of the drill bit has a great influence on the cutting gloss. On mobile phones, especially in high-gloss cutting applications, such as iphone5, the metal frame of high-end TVs adopts high-gloss milling processing technology, coupled with anodizing and wire drawing processes, making the TV set full of fashion as a whole.

5. Anodizing

Anodizing refers to the electrochemical oxidation of metals or alloys. Aluminum and its alloys form oxide films on aluminum products (anode) under corresponding electrolyte and specific process conditions. Anodizing can not only solve the defects of aluminum surface hardness and wear resistance, but also prolong the life of aluminum and improve its appearance. It has become an indispensable part of aluminum surface treatment and is currently the most widely used and very successful technology.

6. Two-color anode

Bi-color anodizing refers to a product that has been anodized to produce different colors in specific areas. Two-color anodizing technology is rarely used in the TV industry, the technology is complex, and the cost is high, but through the two-color contrast, the high-end and unique appearance of the product can be shown.

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